Transformer case structure



Jan. 17, 1939.

R. L. BROWN TRANSFORMER CASE STRUCTURE Filed Dec. 24, 1935 WITNESSES:

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INVENTOR Patented Jan. 17, 1939 TRANSFORMER CASE STRUCTURE Roy L. Brown, Sharon, Pa, assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania Application December 24, 1935, Serial No. 56,005

Claims. (01. 220- 85) 6 that is sufficiently rigid and strong enough to prises sheet iron material of substantially the I support the weight of the core, coils, insulation same thickness or gage as that of the side walls and the cooling and insulating liquids. In order II. In order to strengthen the side walls II and to support the weight of the assembled transthe bottom i2 of the case, it is desirable to proformer, bulky and heavy base structures are provide a structure inside the case suitable for braclO vided for reinforcing and supporting the bottom ing the side walls and the bottom. The structure 10 of the transformer case. These base structures employed is a continuous box girder structure are usually provided as an integral part of the disposed between the side walls II and the botcase structure outside of the case and below the tom i2.

, bottom since the bottom of the case is not rigid The box girder structure 20 comprises a con- 16 or strong enough to permit a lifting of the transtinuous metallic band 2| disposed about the botll former. tom i2 of the case and welded thereto by a weld When such base structures are employed, the 22. As shown in the drawing, the metallic band over-all height of the transformer is greatly in- 2| is disposed in a vertical position on the bottom creased adding to the difficulties encountered in l2 of the case and substantially parallels the $0 shipping or transporting the transformer. shape of the side walls H.

An object of this invention is to provide a trans- As shown in the drawing, gusset plates 23 are former case with a reenforcing structure inside 3 provided in Spaced relation between the metallic the case. band 2| and the side walls H. The gusset plates Another object of this invention is to provide are welded in a vertical position to the continu- 25 a transformer case with a reenforcing base strucous band 2i and to the bottom l2 and side wall ll ture inside the case suitable for supporting the I as by We This p s a ous core and coil assembly of the transformer, box girder structure inside the case between the Other and additional objects of this invention side walls II and the bottom l2, so that any will be better understood from the following de-' stresses encountered in moving the assembled j'scriptionwhen taken in conjunction with the actransformer will e distri u ed r u ho the companying drawing, in whichside walls and bottom of the case structure.

Figure 1 is a sectional view of a transformer In order .to provide for'sllpporting e C re with a core and coil assembly shown taken along 1 and coil assembly l5 and I6 in their proper posithe line II of 2, and tion in the transformer case, benches 25 suitable Fig. 2 is a sectional view/of the bottom of the for receiving the end frames of the core I5 are 35 transformer c'ase taken along the line IIII of provided in the girder'structure 20. The benches Fig. 1, embodying the features of this invention. 25 are constructed by provi in gusset plates 25 Like reference characters in each of the figures between the side walls H and the band 2|. The denote similar parts. gusset plates 26 extend in a vertical direction 40 In the building of large power transformers, it to a plane above the plane of the upper edges 40 is desirable to construct them in as compact form of the gusset plates 23. A sheet ironplate 21 is as possible with the bottom of the case strong provided in a horizontal position on the top edge enough to permit the lifting of the assembled of the gusset plates 26 and is I elded thereto to transformer. provide the seat of the bench 2 These benches 46 Referring to the drawing and Fig. 1 thereof are usually-provided in the corners of the transparticularly, this invention is illustrated as emformer case in order to support the four corners bodied in a transformer Ill. The transformer In of the core assembly but as will be understood by, is of the usual construction comprising a case 9 those skilled in the art, the benches may be prohaving an enclosing wall H of sheet iron or vided elsewhere in the caseas desired.

50 other suitable-material fabricated in any desired Since the core and coil ssem y is o led and a shape, a bottom l2 suitably welded to the enclosnsul ed by t e liquid l9, it is desirable to so Droing wall and a cover i3 mounted on the enclosing vide a box girder structure for strengthening the wall by any suitable means as by the bolts l4. case and supporting the core and coil assembly The case 9 is of sufficient size to contain the core that the circulation of the insulating liquid I 9 to assembly IS, the coil assembly It, leads I! and will not be impeded. This result may be accom- This invention relates to transformers, and particularly to case structures of transformers.

In the large power transformers it is necessary to provide the transformer case with a base bushings l8. An insulating liquid l9 suitable for insulating and cooling the core and coils is contained in the case.

As illustrated, the bottom I2 of the case complished by providing openings 28 in spaced relation near the bottom of the metallic band 2|. With the girder structure in position in the case 9, as shown in the drawing, the inside wall of the metallic band 2| defines an opening in the girder structure for receiving the lower end of the coil assembly l6 that projects below the core assembly IS. The girder structure will thus not interfere'with the conventional core and coil assemblies now used by the trade.

As illustrated in the drawing, the assembled transformer may be provided with removable wheel assemblies 29 mounted in any suitable manner to the base l2 of, the case for assisting in transporting the transformer to its destination. In providing the removable wheel assemblies 29, plates. may be provided on the base of the case and may be attached thereto by any suitable means as by welding. Jack lugs 3| are'permanently attached to the plates 30, so that when it is desired to mount the removable wheel assembly on the case, the case may be easily lifted and the wheel assembly may be bolted to the plates 30.

By providing the box girder structure inside the case, it is evident that the case is so reenforced that the stresses encountered in moving the transformer are distributed throughout the sides and bottom of the case. With this construction the overall height of the transformer may be greatly reduced since an external reinforcing base structure is not necessary. Further, it is seen that since the core and coil assembly is supported directly by the girder structure, the weight of the core and coil assembly will not induce stresses at localized points of the base but instead the stresses will be distributed throughout the side walls and bottom of the case.

Although this invention has been described with reference to a particular embodiment thereof it will be understood by those s ed in the art that other and various modific ons thereof are possible. This invention is, erefore, not to be restricted except insofar tas is necessitated by the prior art and the scope o the appended claims.

I claim as my invention:

1. In a transformer case adapted for enclosing a core and coil assembly, in combination, a fabricated sheet iron wall, a bottom applied to the wall, a continuous metal band disposed on the bottom inside the case in spaced relation to and substantially paralleling the wall, and a plurality of gusset plates disposed in a substantiallyvertical direction between the wall and metal band, certain of the gusset plates extending to a heighth above the-upper edge of the other gusset plates and being adapted to provide a bench for. supporting the core and coil assembly of the transformer, thegusset plates being welded to the wall, bottom and metal band for providing a reenforced case.

2. In a transformer case adapted for containing a liquid suitable for insulating the core and coil assemblies, in combination, a fabricated sheet iron wall, a bottom applied to the wall, a continu-.

ous metal band disposed inside the case on the bottom in spaced relation to and substantially paralleling the wall, and a plurality of gusset plates disposed between the wall and metal band, a plate disposed to bridge certain of the gusset plates for providing a bench for supporting the core and coil assembly of the transformer, the gusset plates being welded to the wall, bottom and metal band for providing a reenforced case,

the metal band having openings therein for facilitating circulation of the insulating liquid.

3. In a transformer case adapted for containing a liquid suitable for insulating the core and coil assemblies, in combination, a fabricated wall, a bottom applied to the wall, a continuous metal band disposed inside the case on the bottom in spaced relation to and substantially paralleling the wall, a plurality of gusset plates disposed in a substantially vertical direction in spaced relation to each other and extending between the wall and metal band, a plate disposed to bridge certain of the gusset plates for providing a bench for seating the core and coil assemblies of the transformer, the metal band being welded to the gusset plates extending therefrom and to the bottom, and the gusset plates being welded to the wall and bottom, to provide a reenforced case, the continuous metal band having openings therein between at least some of the adjacent gusset plates extending therefrom for facilitating circulation of the insulating liquid.

4. In a transformer provided with a case and a core and coil assembly in combination, a continuous metal band disposed on the bottom of the case, gusset plates disposed between the case wall and the continuous metal band, the metal band, gusset plates, wall and bottom all being welded together at their meeting edges to provide a box girder structure on the bottom around the inside of the case into which the lower end of the coil assembly may extend, the box girder structure carrying the weight of the core and coil assembly and serving to distribute the load whereby the case is not distorted.

5. In a transformer provided with a core and coil assembly and a case for containing an insulating liquid in combination, a continuous metal band disposed on the bottom of the case, gusset plates disposed between the case wall and the con-.

tinuous metalband, the metal band, gusset plates, wall and bottom all being welded together at their meeting edges to provide a box girder structure.

on the bottom around the inside of the case,

means disposed on the box girder structure for ROY L. BROWN. 

